<!DOCTYPE html>
<html>
	<head>
		<title>es6第一次练习</title>
		<script type="text/javascript">
			let arr1 = [1,2,3];
			let arr2 = [5,6,7];
			let arr3 = [arr1,arr2];
			alert(arr3);
		</script>
	</head>
	<body>
		
	</body>
</html>